EP0173804B1 - Gas-blast switch - Google Patents

Gas-blast switch Download PDF

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Publication number
EP0173804B1
EP0173804B1 EP85107283A EP85107283A EP0173804B1 EP 0173804 B1 EP0173804 B1 EP 0173804B1 EP 85107283 A EP85107283 A EP 85107283A EP 85107283 A EP85107283 A EP 85107283A EP 0173804 B1 EP0173804 B1 EP 0173804B1
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EP
European Patent Office
Prior art keywords
housing
compressed
contact
case
breaker according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85107283A
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German (de)
French (fr)
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EP0173804A1 (en
Inventor
Jürg Ischi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Publication of EP0173804A1 publication Critical patent/EP0173804A1/en
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Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/025—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • the invention is based on a gas pressure switch according to the preamble of claim 1.
  • the invention relates to a gas pressure switch as described in DE-A-2 811 509.
  • the known switch has an insulating gas-filled, tubular housing in which two contact pieces which are movable relative to one another along the housing axis are arranged.
  • the contact pieces form a U-shaped current loop with two current connections running through the housing wall at right angles to the housing axis.
  • This switch uses an insulating gas to extinguish an arc that is located on the contact pieces when it is switched off, and which is compressed by the arc as a result of heating and is stored in a heating volume surrounding the contact pieces.
  • this switch requires an insulating tube, the inside diameter of which is matched to the outside diameter of one of its movable contact pieces.
  • Such an insulating tube stabilizes the arc on the housing axis which is burning in the course of the U-shaped current loop and is therefore exposed to radial magnetic forces, but is exposed to the direct thermal influence of the arc and is therefore subject to heavy wear.
  • the power connections are offset from one another in the direction of the housing axis, which results in a comparatively large axial overall length.
  • This switch also has a comparatively large overall length, since the two power connections are axially offset from one another below the isolating gap delimiting the switching arc on the housing and the current from the upper of the two electrical connections is first in a casing part of the housing coaxially surrounding the isolating distance and then via a radially extending plate is guided to a nozzle-shaped, fixed contact piece.
  • the current path formed by the jacket part, the plate and the contact pieces receiving the arc in the isolating section consists of axially symmetrical loops which center the arc on the housing axis and prevent its radial migration.
  • the compressed gas switch according to the invention is characterized in that, because of its small overall length in the direction of the contact piece axis, it can be installed in switchgear in such a way that the path of the current to be switched off runs transversely to the contact piece axis. This makes it possible to design the switchgear to be particularly space-saving. In addition, such a switch can be easily installed, since its contact system can be produced independently of its housing and can be attached to a fixed contact located in the housing by simply plugging it on.
  • 1 denotes a cylindrical housing filled with an insulating gas, such as sulfur hexafluoride, for example at a pressure of 4 bar.
  • Bushings 2 and 3 are provided on diametrically opposite sides of the housing 1, through which a power connection 4 and 5 for a movable, fully cylindrical contact piece 6 and a fixedly hollow cylindrical contact piece 7 are guided into the interior of the housing 1.
  • the power connection 2 is electrically conductively connected via a sliding contact (not shown) and, for example, designed as a multi-lamella contact, to the contact piece 6 movable by a drive (not shown) in the direction of an axis shown in broken lines.
  • the movable contact piece 6, like the fixed contact piece 7, is designed to be erosion-resistant. Both contact pieces can be used Transfer of nominal current may be formed, however, when transmitting large nominal currents, it is advantageous to provide the movable contact piece 6 with a nominal current contact 8 shown in dotted lines in FIG dotted) nominal current contact 9 cooperates.
  • This forms a nominal current path which now runs parallel to the contact pieces 6 and 7, which now only act as erosion contacts, and which runs outside a heating volume 10, which consists of a body 11 arranged coaxially with the contact pieces 6 and 7 and made of a pressure-resistant and erosion-resistant insulating material, such as glass-fiber reinforced material Plastic that is surrounded.
  • the contact piece 7 does not necessarily have to be hollow cylindrical. Rather, it is also possible for it to be of fully cylindrical design and to close the heating volume 10. In a corresponding manner, the movable contact piece 6 can be designed as a hollow cylinder.
  • the insulating body 11 has a lower opening, into which the movable contact piece 6 is guided, and an upper opening, in which the fixed contact 7 is fastened to the insulating body 11.
  • the fixed contact 7 contains two contact parts 12 and 13 (FIG. 2) designed as erosion-resistant nozzle half-shells, which are in electrically conductive connection with the power connection 5. This electrically conductive connection can be brought about in that the current connection 5 is led directly to the contact piece 7 or acts only indirectly on the contact piece 7.
  • the power connection 5 is formed from two flat rails 14 and 15 which run parallel to one another and which have fork-like widened ends in the region of the contact piece 7.
  • the ends of the two flat rails 14 and 15 rest on insulating parts 16 and 17, which are supported on diametrically opposite outer surfaces of both contact parts 12 and 13 (see also FIG. 3).
  • the ends of the turns 18, 19 facing away from the flat rails 14, 15 are connected in an electrically conductive manner to a spring ring 21 which is arranged coaxially with the coil 20 and which presses the contact parts 12, 13 together.
  • the spring ring 21 is made of electrically conductive material and therefore mediates the electrical contact between the coil 20 and the contact parts 12 and 13.
  • the two flat rails 14, 15 are under the action of a spring 22.
  • the flat rails 14, 15 are supported on the one hand in a defined manner on the contact parts 12, 13 and, on the other hand, there is a defined contact force between the flat rails 14, 15 and a fixed contact provided in the power connection 23 generated.
  • the contact system described above can be completely preassembled and then only needs to be plugged onto the fixed contact 23 when mounting the compressed gas switch.
  • the power connections 4 and 5 are guided out of the housing 1 essentially transversely to the contact piece axis and each form at least one loop in the interior of the housing.
  • These loops are arranged in a plane containing the bushings 2 and 3 and the contact piece axis and each have a section 24 or 25 which extends in the axial direction and a section 26 or 27 which extends radially to the contact piece axis.
  • the section 24 extends from the bushing 2 downwards, whereas the section 25 extends from the bushing 3 upwards.
  • the section 26 adjoining the section 24 extends into the interior of the housing 1 and ends in the sliding contact enclosing the movable contact piece 6, while the section 27 adjoining the section 25 and also extends into the housing 1 is designed as flat rails 14, 15 as described above and ends at contact piece 7.
  • This gas pressure switch has the mode of operation described below:
  • the movable contact piece 6 When it is switched off, the movable contact piece 6 is moved downward and, after the nominal current contacts 8 and 9, which may be provided, are opened, an arc 28 caused by the current to be switched off is drawn between the subsequently separating contact pieces 6 and 7. Due to the loops provided in the current connections 4 and 5 and designed as described above, the electromagnetic forces acting on the arc 28 cancel each other almost completely, so that the arc 20 burns essentially centrally despite the cross-feed, whereby the contact pieces 6 and 7 burn off evenly is achieved.
  • the configuration of the power connection 5 by means of parallel flat rails 14 and 15 ensures that the frictional forces between the fixed contact piece 7 and the movable contact piece inserted into the fixed contact piece 7 when switched on can be kept low.
  • the erosion on the contact pieces 6 and 7 is further reduced by the fact that the current to be switched off flows through the coil 20.
  • the magnetic field caused by the coil 20 namely causes the arc 28 to rotate about the contact piece axis. Since the coil 20 has two windings 18 and 19, each of which is fed in parallel by a flat rail 14 or 15, the attractive force of the flat rails 14 and 15 is also retained in the region of the fixed contact piece 7.
  • the spring ring 21 which receives the currents flowing through the parallel windings 18 and 19 of the coil 20 effects the current transfer to the contact parts 12 and 13.
  • the spring forces of this ring should be dimensioned in such a way that in the switched-on state, namely when the movable contact piece 6 is in the contact piece 7 is retracted, the force effect of which ensures sufficient current transfer from the fixed to the movable contact piece via the contact parts 12 and 13 for large and small currents. Since, as described above, the attractive and repulsive electromagnetic forces at the contact piece 7 are almost compensated for with large currents when the flat rails 14 and 15 are suitably dimensioned, it is possible to keep the frictional force between the fixed and movable contact piece and thus the contact abrasion low.
  • the arc 28 drawn between the contact pieces 6 and 7 heats the insulating gas vigorously in the high current phase, as a result of which the gas pressure in the heating volume 10 is increased considerably.
  • a vigorous flow of insulating gas stored in the heating volume 10 then sets in through the nozzle opening enclosed by the contact parts 12 and 13 into an expansion space delimited by insulating body 11 and housing 1, through which the arc 28 is blown.
  • a further advantageous effect of the invention is to be seen in the fact that the heated insulating gas entering the expansion space initially strikes the housing 1 on the side facing away from the drive, and during this and during its subsequent outflow along the wall of the housing into the nominal current contacts 8, if applicable , 9 containing part of the housing is cooled considerably.
  • the nominal current contacts 8, 9, if provided, are then effectively protected against direct contamination by the extinguishing gases emerging from the heating volume 10 and heated to high temperatures, despite the short overall length of the housing in the axial direction.
  • An additional magnetic blowing is achieved here by the coil 20, in particular if it is arranged in the region of the narrowest part of the opening of the contact piece 7.
  • a further blowing can also be achieved in that the lower opening in the insulating material body 11 is designed as a nozzle that can be released by the movable contact piece 6 or when the movable contact piece 6 itself is designed as a nozzle.

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Description

Bei der Erfindung wird ausgegangen von einem Druckgasschalter nach dem Oberbegriff von Patentanspruch 1.The invention is based on a gas pressure switch according to the preamble of claim 1.

Mit diesem Oberbegriff nimmt die Erfindung auf einen Druckgasschalter Bezug, wie er in DE-A-2 811 509 beschrieben ist. Der bekannte Schalter weist ein isoliergasgefülltes, rohrförmiges Gehäuse auf, in dem zwei längs der Gehäuseachse relativ zueinander bewegliche Kontaktstücke angeordnet sind. Die Kontaktstücke bilden mit zwei quer zur Gehäuseachse durch die Gehäusewand geführten Stromanschlüssen eine U-förmige Stromschleife.With this preamble, the invention relates to a gas pressure switch as described in DE-A-2 811 509. The known switch has an insulating gas-filled, tubular housing in which two contact pieces which are movable relative to one another along the housing axis are arranged. The contact pieces form a U-shaped current loop with two current connections running through the housing wall at right angles to the housing axis.

Bei diesem Schalter wird zum Löschen eines beim Ausschalten auf den Kontaktstücken fussenden Lichtbogens lsoliergas verwendet, weiches durch den Lichtbogen infolge Aufheizens komprimiert und in einem die Kontaktstücke umgebenden Heizvolumen gespeichert wird. Hierzu benötigt dieser Schalter ein lsolierrohr, dessen Innendurchmesser an den Aussendurchmesser eines beweglichen seiner beiden Kontaktstücke angepasst ist. Ein solches Isolierrohr stabilisiert zwar den im Zuge der U-förmigen Stromschleife brennenden und daher radialen magnetischen Kräften ausgesetzten Lichtbogen auf der Gehäuseachse, ist aber der unmittelbaren thermischen Einwirkung des Lichtbogens ausgesetzt und damit starkem Verschleiss unterworfen. Darüber hinaus sind beim bekannten Schalter die Stromanschlüsse in Richtung der Gehäuseachse gegeneinander versetzt, wodurch sich eine vergleichsweise grosse axiale Baulänge ergibt.This switch uses an insulating gas to extinguish an arc that is located on the contact pieces when it is switched off, and which is compressed by the arc as a result of heating and is stored in a heating volume surrounding the contact pieces. For this purpose, this switch requires an insulating tube, the inside diameter of which is matched to the outside diameter of one of its movable contact pieces. Such an insulating tube stabilizes the arc on the housing axis which is burning in the course of the U-shaped current loop and is therefore exposed to radial magnetic forces, but is exposed to the direct thermal influence of the arc and is therefore subject to heavy wear. In addition, in the known switch, the power connections are offset from one another in the direction of the housing axis, which results in a comparatively large axial overall length.

Weitere Druckgasschalter, bei denen der Schaltlichtbogen durch lsoliergas gelöscht wird, welches durch den Lichtbogen infolge Aufheizens komprimiert und in einem die Kontaktstücke umgebenden Heizvolumen gespeichert wird, sind aus US-A-4 139 752 und DE-A-2 342 520 bekannt. Beim Schalter nach US-A-4 139 752 wird der abzuschaltende Strom zentral an die Kontaktstücke geführt, wodurch sich eine vergleichsweise grosse axiale Baulänge des Schalters ergibt. Beim Schalter nach DE-A-2 342 520 wird der Strom quer zur Gehäuseachse an das als Stromzuführung dienende Gehäuse geführt. Auch dieser Schalter weist eine vergleichsweise grosse axiale Baulänge auf, da beide Stromanschlüsse in axialer Richtung gegeneinander versetzt unterhalb der den Schaltlichtbogen begrenzenden Trennstrecke am Gehäuse befestigt sind und der Strom vom oberen der beiden Stromanschlüsse zunächst in ein die Trennstrecke koaxial umgebendes Mantelteil des Gehäuses und dann über eine radial erstreckte Platte an ein düsenförmig ausgebildetes, feststehendes Kontaktstück geführt wird. Der vom Mantelteil, der Platte und den den Lichtbogen in der Trennstrecke aufnehmenden Kontaktstücken gebildete Strompfad besteht aus axialsymmetrischen Schleifen, welche den Lichtbogen auf der Gehäuseachse zentrieren und dessen radiales Auswandern verhindern.Further compressed gas switches in which the switching arc is extinguished by insulating gas, which is compressed by the arc as a result of heating and is stored in a heating volume surrounding the contact pieces, are known from US-A-4 139 752 and DE-A-2 342 520. In the switch according to US-A-4 139 752, the current to be switched off is routed centrally to the contact pieces, which results in a comparatively large axial length of the switch. In the switch according to DE-A-2 342 520, the current is conducted transversely to the housing axis to the housing serving as a power supply. This switch also has a comparatively large overall length, since the two power connections are axially offset from one another below the isolating gap delimiting the switching arc on the housing and the current from the upper of the two electrical connections is first in a casing part of the housing coaxially surrounding the isolating distance and then via a radially extending plate is guided to a nozzle-shaped, fixed contact piece. The current path formed by the jacket part, the plate and the contact pieces receiving the arc in the isolating section consists of axially symmetrical loops which center the arc on the housing axis and prevent its radial migration.

Es ist Aufgabe der Erfindung, einen Druckgasschalter der eingangs genannten Art anzugeben, welcher einfach aufgebaut ist und in Richtung einer die Bewegung der Kontaktstücke definierenden Achse eine geringe Baulänge aufweist.It is an object of the invention to provide a gas pressure switch of the type mentioned at the outset, which is of simple construction and has a short overall length in the direction of an axis defining the movement of the contact pieces.

Die Aufgabe wird in Verbindung mit den Merkmalen des Oberbegriffs gemäss dem kennzeichnenden Teil des Anspruchs 1 gelöst. Der erfindungsgemässe Druckgasschalter zeichnet sich dadurch aus, dass er wegen seiner geringen Baulänge in Richtung der Kontaktstückachse derart in Schaltanlagen eingebaut werden kann, dass die Bahn des abzuschaltenden Stromes quer zur Kontaktstückachse verläuft. Hierdurch ist es möglich die Schaltanlage besonders raumsparend auszubilden. Darüber hinaus lässt sich ein solcher Schalter einfach montieren, da dessen Kontaktsystem unabhängig von seinem Gehäuse hergestellt und durch einfaches Aufstecken auf einen im Gehäuse befindlichen Festkontakt befestigt werden kann.The object is achieved in connection with the features of the preamble according to the characterizing part of claim 1. The compressed gas switch according to the invention is characterized in that, because of its small overall length in the direction of the contact piece axis, it can be installed in switchgear in such a way that the path of the current to be switched off runs transversely to the contact piece axis. This makes it possible to design the switchgear to be particularly space-saving. In addition, such a switch can be easily installed, since its contact system can be produced independently of its housing and can be attached to a fixed contact located in the housing by simply plugging it on.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung beschriebenen Ausfuhrungsbeispiels näher erläutert.The invention is explained in more detail below with reference to an exemplary embodiment described in the drawing.

Hierbei zeigt:

  • Fig. 1 eine Aufsicht auf einen Schnitt nach der Linie I-I von Fig. 2 durch ein Ausführungsbeispiel des erfindungsgemäss ausgebildeten Druckgasschalters,
  • Fig. 2 eine Aufsicht auf einen Teilschnitt nach der Linie 11-11 der Fig. 1 durch das Ausführungsbeispiel des erfindungsgemäss ausgebildeten Druckgasschalters, und
  • Fig. 3 eine von links auf ein feststehendes Kontaktstück des Druckgasschalters nach Fig. 1 erfolgende Aufsicht, bei der Teile des Schalters entfernt sind.
Here shows:
  • 1 is a plan view of a section along the line II of FIG. 2 through an embodiment of the pressure gas switch designed according to the invention,
  • Fig. 2 is a plan view of a partial section along the line 11-11 of Fig. 1 by the embodiment of the pressure gas switch designed according to the invention, and
  • Fig. 3 is a left-hand view of a fixed contact piece of the pressure gas switch according to Fig. 1, in which parts of the switch are removed.

In Fig. 1 bezeichnet 1 ein mit einem Isoliergas, wie etwa Schwefelhexafluorid von beispielsweise 4 bar Druck, gefülltes, zylinderförmiges Gehäuse. An einander diametral gegenüberliegenden Seiten des Gehäuses 1 sind Durchführungen 2 bzw. 3 vorgesehen, durch welche jeweils ein Stromanschluss 4 bzw. 5 für ein bewegliches vollzylindrisch ausgebildetes Kontaktstück 6 bzw. ein feststehend hohlzylindrisch ausgebildetes Kontaktstück 7 ins Innere des Gehäuses 1 geführt sind. Der Stromanschluss 2 ist über einen nicht dargestellten und beispielsweise als Viellamellenkontakt ausgebildeten Gleitkontakt mit dem durch einen nicht dargestellten Antrieb in Richtung einer strichpunktiert dargestellten Achse beweglichen Kontaktstück 6 elektrisch leitend verbunden.In FIG. 1, 1 denotes a cylindrical housing filled with an insulating gas, such as sulfur hexafluoride, for example at a pressure of 4 bar. Bushings 2 and 3 are provided on diametrically opposite sides of the housing 1, through which a power connection 4 and 5 for a movable, fully cylindrical contact piece 6 and a fixedly hollow cylindrical contact piece 7 are guided into the interior of the housing 1. The power connection 2 is electrically conductively connected via a sliding contact (not shown) and, for example, designed as a multi-lamella contact, to the contact piece 6 movable by a drive (not shown) in the direction of an axis shown in broken lines.

Das bewegliche Kantaktstück 6 ist ebenso wie das feststehende Kontaktstück 7 abbrandfest ausgebildet. Beide Kontaktstücke können zur Übertragung von Nennstrom ausgebildet sein, jedoch ist es bei der Übertragung grosser Nennströme vorteilhaft, das bewegliche Kontaktstück 6 mit einem in der Fig. 1 punktiert dargestellten Nennstromkontakt 8 zu versehen, welcher mit einem mit dem feststehenden Kontaktstück 7 verbundenen und am Stromanschluss 5 befestigten (ebenfalls punktiert dargestellten) Nennstromkontakt 9 zusammenarbeitet. Hierdurch wird ein zu den nun lediglich als Abbrandkontakte wirkenden Kontaktstücken 6 und 7 parallel verlaufender Nennstrompfad gebildet, welcher ausserhalb eines Heizvolumens 10 verläuft, das von einem koaxial zu den Kontaktstücken 6 und 7 angeordneten Körper 11 aus einem druck- und abbrandfesten lsolierstoff, wie etwa glasfaserverstärktem Kunststoff, umgeben ist. Das Kontaktstück 7 muss nicht notwendigerweise hohlzylindrisch ausgebildet sein. Es ist vielmehr auch möglich, dass es vollzylindrisch ausgebildet ist und das Heizvolumen 10 abschliesst. In entsprechender Weise kann das bewegliche Kontaktstück 6 hohlzylindrisch ausgebildet sein.The movable contact piece 6, like the fixed contact piece 7, is designed to be erosion-resistant. Both contact pieces can be used Transfer of nominal current may be formed, however, when transmitting large nominal currents, it is advantageous to provide the movable contact piece 6 with a nominal current contact 8 shown in dotted lines in FIG dotted) nominal current contact 9 cooperates. This forms a nominal current path which now runs parallel to the contact pieces 6 and 7, which now only act as erosion contacts, and which runs outside a heating volume 10, which consists of a body 11 arranged coaxially with the contact pieces 6 and 7 and made of a pressure-resistant and erosion-resistant insulating material, such as glass-fiber reinforced material Plastic that is surrounded. The contact piece 7 does not necessarily have to be hollow cylindrical. Rather, it is also possible for it to be of fully cylindrical design and to close the heating volume 10. In a corresponding manner, the movable contact piece 6 can be designed as a hollow cylinder.

Der isolierstoffkörper 11 weist eine untere Öffnung auf, in welche das bewegliche Kontaktstück 6 geführt ist, sowie eine obere Öffnung, in welcher der feststehende Kontakt 7 am Isolierstoffkörper 11 befestigt ist. Der feststehende Kontakt 7 enthält zwei als abbrandfeste Düsenhalbschalen ausgebildete Kontaktteile 12 und 13 (Fig. 2), welche in elektrisch leitender Verbindung mit dem Stromanschluss 5 stehen. Diese elektrisch leitende Verbindung kann dadurch bewirkt werden, dass der Stromanschluss 5 unmittelbar an das Kontaktstück 7 geführt ist oder nur mittelbar auf das Kontaktstück 7 wirkt.The insulating body 11 has a lower opening, into which the movable contact piece 6 is guided, and an upper opening, in which the fixed contact 7 is fastened to the insulating body 11. The fixed contact 7 contains two contact parts 12 and 13 (FIG. 2) designed as erosion-resistant nozzle half-shells, which are in electrically conductive connection with the power connection 5. This electrically conductive connection can be brought about in that the current connection 5 is led directly to the contact piece 7 or acts only indirectly on the contact piece 7.

Wie aus Fig. 2 ersichtlich, ist bei der beschriebenen Ausführungsform der Stromanschluss 5 aus zwei parallel zueinander verlaufenden Flachschienen 14 und 15 gebildet, welche im Bereich des Kontaktstückes 7 gegeneinander gabelförmig aufgeweitete Enden aufweisen. Die Enden der beiden Flachschienen 14 und 15 ruhen auf Isolierstoffteilen 16 bzw. 17, welche auf einander diametral gegenüberliegenden Aussenflächen beider Kontaktteile 12 bzw. 13 abgestützt sind (vgl. auch Fig. 3). Hierdurch ist es möglich, den zugeführten Strom in getrennte Windungen 18 bzw. 19 einer Spule 20 einzuspeisen, welche die Kontaktteile 12, 13 des Kontaktstückes 7 koaxial umgibt. Zu diesem Zweck sind die von den Flachschienen 14, 15 abgewandten Enden der Windungen 18,19 in elektrisch leitender Weise mit einem koaxial zur Spule 20 angeordneten Federring 21 verbunden, welcher die Kontaktteile 12, 13 zusammenpresst. Der Federring 21 ist aus elektrisch leitendem Material und vermittelt daher den elektrischen Kontakt zwischen der Spule 20 und den Kontaktteilen 12 bzw. 13.As can be seen from FIG. 2, in the embodiment described the power connection 5 is formed from two flat rails 14 and 15 which run parallel to one another and which have fork-like widened ends in the region of the contact piece 7. The ends of the two flat rails 14 and 15 rest on insulating parts 16 and 17, which are supported on diametrically opposite outer surfaces of both contact parts 12 and 13 (see also FIG. 3). This makes it possible to feed the supplied current into separate turns 18 or 19 of a coil 20 which coaxially surrounds the contact parts 12, 13 of the contact piece 7. For this purpose, the ends of the turns 18, 19 facing away from the flat rails 14, 15 are connected in an electrically conductive manner to a spring ring 21 which is arranged coaxially with the coil 20 and which presses the contact parts 12, 13 together. The spring ring 21 is made of electrically conductive material and therefore mediates the electrical contact between the coil 20 and the contact parts 12 and 13.

Die beiden Flachschienen 14,15 stehen unter der Wirkung einer Feder 22. Hierdurch werden die Flachschienen 14,15 einerseits in definierter Weise auf den Kontaktteilen 12, 13 abgestützt und wird andererseits eine definierte Kontaktkraft zwischen den Flachschienen 14, 15 und einem im Stromanschluss vorgesehenen Festkontakt 23 erzeugt. Das vorstehend beschriebene Kontaktsystem kann komplett vormontiert werden und braucht dann bei der Montage des Druckgasschalters lediglich noch auf den Festkontakt 23 aufgesteckt zu werden.The two flat rails 14, 15 are under the action of a spring 22. As a result, the flat rails 14, 15 are supported on the one hand in a defined manner on the contact parts 12, 13 and, on the other hand, there is a defined contact force between the flat rails 14, 15 and a fixed contact provided in the power connection 23 generated. The contact system described above can be completely preassembled and then only needs to be plugged onto the fixed contact 23 when mounting the compressed gas switch.

Wie aus Fig. 1 zu entnehmen ist, sind die Stromanschlüsse 4 und 5 im wesentlichen quer zur Kontaktstückachse aus dem Gehäuse 1 geführt und bilden im Inneren des Gehäuses jeweils mindestens eine Schleife. Diese Schleifen sind in einer die Durchführungen 2 und 3 sowie die Kontaktstückachse enthaltenden Ebene angeordnet und weisen jeweils einen in axialer Richtung erstreckten Abschnitt 24 bzw. 25 sowie jeweils einen radial zur Kontaktstückachse erstreckten Abschnitt 26 bzw. 27 auf. Der Abschnitt 24 erstreckt sich von der Durchführung 2 nach unten, hingegen der Abschnitt 25 von der Durchführung 3 nach oben. Der an den Abschnitt 24 anschliessenden Abschnitt 26 erstreckt sich ins Innere des Gehäuses 1 und endet in dem das bewegliche Kontaktstück 6 umschliessenden Gleitkontakt, während der an den Abschnitt 25 anschliessende ebenfalls ins Gehäuse 1 erstreckte Abschnitt 27 wie vorstehend beschrieben als Flachschienen 14,15 ausgebildet ist und am Kontaktstück 7 endet.As can be seen from FIG. 1, the power connections 4 and 5 are guided out of the housing 1 essentially transversely to the contact piece axis and each form at least one loop in the interior of the housing. These loops are arranged in a plane containing the bushings 2 and 3 and the contact piece axis and each have a section 24 or 25 which extends in the axial direction and a section 26 or 27 which extends radially to the contact piece axis. The section 24 extends from the bushing 2 downwards, whereas the section 25 extends from the bushing 3 upwards. The section 26 adjoining the section 24 extends into the interior of the housing 1 and ends in the sliding contact enclosing the movable contact piece 6, while the section 27 adjoining the section 25 and also extends into the housing 1 is designed as flat rails 14, 15 as described above and ends at contact piece 7.

Dieser Druckgasschalter weist die nachfolgend beschriebene Wirkungsweise auf:This gas pressure switch has the mode of operation described below:

Beim Ausschalten wird das bewegliche Kontaktstück 6 nach unten bewegt und nach Öffnen der ggfs. vorgesehenen Nennstromkontakte 8 und 9 zwischen den sich nachfolgend trennenden Kontaktstücken 6 und 7 ein vom abzuschaltenden Strom hervorgerufener Lichtbogen 28 gezogen. Durch die in den Stromanschlüssen 4 und 5 vorgesehenen und wie vorstehend beschrieben ausgebildeten Schleifen heben sich die auf den Lichtbogen 28 wirkenden elektromagnetischen Kräfte nahezu vollständig auf, so dass der Lichtbogen 20 trotz Quereinspeisung im wesentlichen zentrisch brennt, wodurch ein gleichmässiger Abbrand der Kontaktstücke 6 und 7 erreicht wird.When it is switched off, the movable contact piece 6 is moved downward and, after the nominal current contacts 8 and 9, which may be provided, are opened, an arc 28 caused by the current to be switched off is drawn between the subsequently separating contact pieces 6 and 7. Due to the loops provided in the current connections 4 and 5 and designed as described above, the electromagnetic forces acting on the arc 28 cancel each other almost completely, so that the arc 20 burns essentially centrally despite the cross-feed, whereby the contact pieces 6 and 7 burn off evenly is achieved.

Darüber hinaus wird durch die Ausbildung des Stromanschlusses 5 mittels parallel geführter Flachschienen 14 und 15 erzielt, dass die Reibungskräfte zwischen dem feststehenden Kontaktstück 7 und dem im Einschaltzustand in das feststehende Kontaktstück 7 eingeführten beweglichen Kontaktstück gering gehalten werden können. Hierzu ist es lediglich erforderlich, den Abstand und die Länge der Flachschienen 14 und 15 derart zu bemessen, dass die durch die Parallelströme in den Flachschienen hervorgerufenen anziehenden Kräfte am Ort des feststehenden Kontaktstückes 7 durch die beim Stromübergang von den Flachschienen auf das feststehende Kontaktstück 7 hervorgerufenen abstossenden Kräfte nahezu kompensiert werden.In addition, the configuration of the power connection 5 by means of parallel flat rails 14 and 15 ensures that the frictional forces between the fixed contact piece 7 and the movable contact piece inserted into the fixed contact piece 7 when switched on can be kept low. For this it is only necessary to dimension the distance and the length of the flat rails 14 and 15 such that the attractive forces caused by the parallel currents in the flat rails at the location of the fixed contact piece 7 are caused by those caused by the current transfer from the flat rails to the fixed contact piece 7 repulsive forces are almost compensated.

Der Abbrand an den Kontaktstücken 6 und 7 wird dadurch noch zusätzlich verringert, dass der abzuschaltende Strom durch die Spule 20 fliesst. Das durch die Spule 20 hervorgerufene magnetische Feld bewirkt nämlich eine Rotation des Lichtbogens 28 um die Kontaktstückachse. Da die Spule 20 zwei von je einer Flachschiene 14 bzw. 15 parallel eingespeiste Windungen 18 bzw. 19 aufweist, bleibt hierbei die anziehende Kraft der Flachschienen 14 und 15 auch im Bereich des feststehenden Kontaktstückes 7 erhalten. Der die durch die parallelen Windungen 18 und 19 der Spule 20 fliessenden Ströme aufnehmende Federring 21 bewirkt den Stromübergang auf die Kontaktteile 12 und 13. Die Federkräfte dieses Ringes sollten hierbei derart bemessen sein, dass im Einschaltzustand, wenn nämlich das bewegliche Kontaktstück 6 in das Kontaktstück 7 eingefahren ist, dessen Kraftwirkung über die Kontaktteile 12 und 13 bei grossen und kleinen Strömen einen ausreichenden Stromübergang vom feststehenden auf das bewegliche Kontaktstück gewährleistet. Da sich wie vorstehend beschrieben bei grossen Strömen die anziehenden und abstossenden elektromagnetischen Kräfte am Kontaktstück 7 bei geeigneter Bemessung der Flachschienen 14 und 15 nahezu kompensieren, ist es möglich, die Reibungskraft zwischen feststehendem und beweglichem Kontaktstück und damit den Kontaktabrieb gering zu halten.The erosion on the contact pieces 6 and 7 is further reduced by the fact that the current to be switched off flows through the coil 20. The magnetic field caused by the coil 20 namely causes the arc 28 to rotate about the contact piece axis. Since the coil 20 has two windings 18 and 19, each of which is fed in parallel by a flat rail 14 or 15, the attractive force of the flat rails 14 and 15 is also retained in the region of the fixed contact piece 7. The spring ring 21 which receives the currents flowing through the parallel windings 18 and 19 of the coil 20 effects the current transfer to the contact parts 12 and 13. The spring forces of this ring should be dimensioned in such a way that in the switched-on state, namely when the movable contact piece 6 is in the contact piece 7 is retracted, the force effect of which ensures sufficient current transfer from the fixed to the movable contact piece via the contact parts 12 and 13 for large and small currents. Since, as described above, the attractive and repulsive electromagnetic forces at the contact piece 7 are almost compensated for with large currents when the flat rails 14 and 15 are suitably dimensioned, it is possible to keep the frictional force between the fixed and movable contact piece and thus the contact abrasion low.

Der zwischen den Kontaktstücken 6 und 7 gezogene Lichtbogen 28 heizt in der Hochstromphase das Isoliergas kräftig auf, wodurch der Gasdruck im Heizvolumen 10 kräftig erhöht wird. Bei Annäherung an einen Nulldurchgang des abzuschaltenden Stromes setzt sodann eine kräftige Strömung von im Heizvolumen 10 gespeicherten lsoliergas durch die von den Kontaktteilen 12 und 13 umschlossene Düsenöffnung in einen durch lsolierstoffkörper 11 und Gehäuse 1 begrenzten Expansionsraum ein, durch welche der Lichtbogen 28 beblasen wird. Hierbei ist eine weitere vorteilhafte Wirkung der Erfindung darin zu sehen, dass das in den Expansionsraum gelangende aufgeheizte Isoliergas zunächst an der vom Antrieb abgewandten Seite auf das Gehäuse 1 prallt und hierbei sowie während seines nachfolgenden Abströmens längs der Wand des Gehäuses in den gegebenenfalls die Nennstromkontakte 8, 9 enthaltenden Teil des Gehäuses beträchtlich abgekühlt wird. Die ggfs. vorgesehenen Nennstromkontakte 8, 9 sind dann trotz kurzer Baulänge des Gehäuses in axialer Richtung in wirkungsvollen Weise vor unmittelbarer Kontamination durch die aus dem Heizvolumen 10 austretenden und auf hohe Temperaturen aufgeheizten Löschgase geschützt.The arc 28 drawn between the contact pieces 6 and 7 heats the insulating gas vigorously in the high current phase, as a result of which the gas pressure in the heating volume 10 is increased considerably. When the current to be switched off approaches a zero crossing, a vigorous flow of insulating gas stored in the heating volume 10 then sets in through the nozzle opening enclosed by the contact parts 12 and 13 into an expansion space delimited by insulating body 11 and housing 1, through which the arc 28 is blown. Here, a further advantageous effect of the invention is to be seen in the fact that the heated insulating gas entering the expansion space initially strikes the housing 1 on the side facing away from the drive, and during this and during its subsequent outflow along the wall of the housing into the nominal current contacts 8, if applicable , 9 containing part of the housing is cooled considerably. The nominal current contacts 8, 9, if provided, are then effectively protected against direct contamination by the extinguishing gases emerging from the heating volume 10 and heated to high temperatures, despite the short overall length of the housing in the axial direction.

Eine zusätzliche magnetische Beblasung wird hierbei noch durch die Spule 20 erreicht, insbesondere dann, wenn sie im Bereich des engsten Teils der Öffnung des Kontaktstückes 7 angeordnet ist. Eine weitere Beblasung kann ferner noch dadurch erzielt werden, dass die untere Öffnung im Isolierstoffkörper 11 als vom beweglichen Kontsktstück 6 freigebbare Düse ausgebildet ist oder wenn das bewegliche Kontaktstück 6 selbst als Düse ausgebildet ist.An additional magnetic blowing is achieved here by the coil 20, in particular if it is arranged in the region of the narrowest part of the opening of the contact piece 7. A further blowing can also be achieved in that the lower opening in the insulating material body 11 is designed as a nozzle that can be released by the movable contact piece 6 or when the movable contact piece 6 itself is designed as a nozzle.

Claims (8)

1. Compressed-gas breaker having an insulating gasfilled-housing (1), two cylindrical contact members (6, 7) which can be moved relatively with respect to one another along an axis in the housing (1), two current terminals (4, 5) which are electrically conductively connected to the contact members (6, 7) and are essentially conducted out of the housing (1) transversely with respect to the contact member axis, a heating volume (10) which is surrounded by an insulating-material body (11) and into which the free ends of the contact members (6, 7), facing away from the contact terminals (4, 5), are conducted at least in the made condition, and at least one nozzle-shaped opening connecting the heating volume (10) to an expansion space, characterized in that the current terminals (4, 5) are conducted out of the housing at sides of the housing (1) which are diametrically opposite to one another and in the interior of the housing (1) in each case form at least one loop, which loops are arranged in a common plane and are constructed in such a manner that the current to be interrupted flows through them in opposite directions.
2. Compressed-gas breaker according to claim 1, characterized in that the loops in each case exhibit a first section (24, 25) extending in the axial direction and a second section (26, 27) which in each case extends radially with respect to the contact member axis, and that the first sections (24, 25) extend from the lead-throughs (2, 3) in opposite directions and in each case connect to the second sections (26, 27) at the ends fac ing away from the lead-throughs (2, 3).
3. Compressed-gas breaker according to claim 2, characterized in that the current terminal (5) electrically conductively connected to a fixed one (7) of the two contact members (6, 7) is in each case formed, at least in its second section (27), by at least two flat rails (14, 15) which are arranged in parallel with one another and which are supported on outside faces of the fixed contact member (7) which are opposite to one another.
4. Compressed-gas breaker according to claim 3, characterized in that the fixed contact member (7) is attached in an opening of the insulating material body (11) limiting the heating volume (10) and that the flat rails (14, 15) are electrically insulated with respect to this contact member (7) and in each case exhibit one terminal at in each case one of at least two windings (18, 19) of a coil (20) which surrounds the fixed contact member (7) and is electrically conductively connected to the latter.
5. Compressed-gas breaker according to claim 4, characterized in that the fixed contact member (7) exhibits two contact parts (12, 13) which are constructed.as nozzle half shells and are supported in the opening of the insulating material body (11) and which are electrically conductively supported on a spring washer (21) which is electrically conductively connected to the windings (18,19) of the coil (20).
6. Compressed-gas breaker according to claim 5, characterized in that the contact members (6, 7) are in each case electrically conductively connected to ratedcurrent contacts (8, 9) which are mounted at the side of the housing (1) facing away from the nozzle opening of the nozzle half shells.
7. Compressed-gas breaker according to one of claims 3 to 6, characterized in that the flat rails (14, 15) are under the action of a spring (22).
8. Compressed-gas breaker according to claim 7, characterized in that the flat rails (14, 15) can be plugged onto a fixed contact (23).
EP85107283A 1984-08-22 1985-06-13 Gas-blast switch Expired EP0173804B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH401584 1984-08-22
CH4015/84 1984-08-22

Publications (2)

Publication Number Publication Date
EP0173804A1 EP0173804A1 (en) 1986-03-12
EP0173804B1 true EP0173804B1 (en) 1988-09-21

Family

ID=4268211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107283A Expired EP0173804B1 (en) 1984-08-22 1985-06-13 Gas-blast switch

Country Status (4)

Country Link
US (1) US4665288A (en)
EP (1) EP0173804B1 (en)
JP (1) JPH07101581B2 (en)
DE (2) DE3435967A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617633B1 (en) * 1987-07-02 1989-11-17 Merlin Gerin CIRCUIT BREAKER WITH ROTATING ARC AND EXPANSION
US5140107A (en) * 1991-07-02 1992-08-18 Ncr Corporation Digitizer screen and method of making
US5464956A (en) * 1994-04-08 1995-11-07 S&C Electric Company Rotating arc interrupter for loadbreak switch
DE19613568A1 (en) * 1996-04-04 1997-10-09 Asea Brown Boveri Circuit breaker

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485463A (en) * 1936-10-31 1938-05-20 British Electrical & Allied In Improvements in or relating to electrical circuit breakers
DE1864376U (en) * 1962-08-10 1962-12-27 Calor Emag Elektrizitaets Ag HIGH VOLTAGE SWITCHING DEVICE WITH MANUAL SWITCHING BRIDGES.
FR1366760A (en) * 1963-12-06 1964-07-17 Coq France Interrupting chamber for on-load switch
US3632932A (en) * 1969-08-08 1972-01-04 Gen Electric Current-limiting circuit breaker having a field strap assembly
NL7306760A (en) * 1973-05-15 1974-11-19
DE2339652A1 (en) * 1973-08-04 1975-02-20 Bbc Brown Boveri & Cie ERASING CHAMBER FOR MEDIUM AND HIGH VOLTAGE SWITCHING DEVICES
DE2342520A1 (en) * 1973-08-23 1975-03-06 Calor Emag Elektrizitaets Ag HV gas-blast cct. breaker - has pressure chamber connected to electrode forming nozzle and expansion chamber for arc quenching
JPS50156675A (en) * 1974-05-31 1975-12-18
JPS53117767A (en) * 1977-03-24 1978-10-14 Mitsubishi Electric Corp Switch
DE7740357U1 (en) * 1977-12-30 1980-11-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Gas switch
FR2459543A1 (en) * 1979-06-15 1981-01-09 Alsthom Cgee HIGH VOLTAGE CIRCUIT BREAKER WITH ROTATING ARC AND SELF-BLOWING

Also Published As

Publication number Publication date
JPS6161322A (en) 1986-03-29
JPH07101581B2 (en) 1995-11-01
DE3565190D1 (en) 1988-10-27
EP0173804A1 (en) 1986-03-12
DE3435967A1 (en) 1986-03-06
US4665288A (en) 1987-05-12

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